Understanding the electronic behavior of MXene (Ti₃C₂) and Fe based SCO heterostructure

Abstract: Composites of 2D layered materials and local moment molecular systems are intensely explored due to the potential for extraordinary electronic and optical properties. Similar to 2D materials, spin crossover molecules (SCO) have gained great attention for the development of next-generation memory devices¹ due to their bistable switching nature. The heterostructure of the SCO and the inorganic 2D materials^2,3 paves a way to lower impedance in a device structure where the spin crossover thin film resistance might be very large. In this study, we make an effort to understand the electronic properties of [Fe{H₂B(pz)₂}₂(bipy)] – MXene (Ti₃C₂) heterostructures by investigating the charge transfer between these materials using X-ray magnetic dichroism (XMCD) spectroscopy. The effect of MXene on reversible voltage controlled isothermal switching between high and low spin states of [Fe{H₂B(pz)₂}₂(bipy)] is studied using UV-Vis spectroscopy.

References

1. Ekanayaka, T. K. et al. Nonvolatile Voltage Controlled Molecular Spin-State Switching for Memory Applications. Magnetochemistry 7, 37 (2021).

2. Senthil Kumar, K. et al. A spin crossover (SCO) active graphene-iron( ii ) complex hybrid material. Dalton Trans. 47, 35–40 (2018).

3. Torres-Cavanillas, R. et al. Spin-crossover nanoparticles anchored on MoS2 layers for heterostructures with tunable strain driven by thermal or light-induced spin switching. Nat. Chem. 13, 1101–1109 (2021).